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Observation of parabolic electron bands on superconductor LaRu2As2 |
| Xingtai Zhou(周兴泰)1,2, Geng Li(李更)1,2,3,†, Lulu Pan(潘禄禄)1,2, Zichao Chen(陈子超)1,2, Meng Li(李萌)1,2, Yanhao Shi(时延昊)1,2, Haitao Yang(杨海涛)1,2, and Hong-Jun Gao(高鸿钧)1,2,3 |
1 Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 Hefei National Laboratory, Hefei 230088, China |
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Abstract Ru-based superconductor LaRu$_{2}$As$_{2}$ has been discovered exhibiting the highest critical temperature of $\sim 7.8 $ K among iron-free transition metal pnictides with the ThCr$_{2}$Si$_{2}$-type crystal structure. However, microscopic research on this novel superconducting material is still lacking. Here, we utilize scanning tunneling microscopy/spectroscopy to uncover the superconductivity and surface structure of LaRu$_{2}$As$_{2}$. Two distinct terminating surfaces are identified on the cleaved crystals, namely, the As surface and the La surface. Atomic missing line defects are observed on the La surface. Both surfaces exhibit a superconducting gap of $\sim 1.0 $ meV. By employing quasiparticle interference techniques, we observe standing wave patterns near the line defects on the La atomic plane. These patterns are attributed to quasiparticle scattering from two electron type parabolic bands.
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Received: 07 April 2024
Revised: 10 May 2024
Accepted manuscript online: 20 May 2024
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PACS:
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74.70.-b
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(Superconducting materials other than cuprates)
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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68.37.-d
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(Microscopy of surfaces, interfaces, and thin films)
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68.35.Dv
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(Composition, segregation; defects and impurities)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62488201 and 52072401), the National Key R&D Program of China (Grant No. 2019YFA0308500), the Chinese Academy of Sciences (Grant No. YSBR-003), and the Innovation Program of Quantum Science and Technology (Grant No. 2021ZD0302700). |
Corresponding Authors:
Geng Li
E-mail: gengli.iop@iphy.ac.cn
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Cite this article:
Xingtai Zhou(周兴泰), Geng Li(李更), Lulu Pan(潘禄禄), Zichao Chen(陈子超), Meng Li(李萌), Yanhao Shi(时延昊), Haitao Yang(杨海涛), and Hong-Jun Gao(高鸿钧) Observation of parabolic electron bands on superconductor LaRu2As2 2024 Chin. Phys. B 33 077401
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